Combined metal mold for casting and stripping ingots



Dec. 29, 1936. s; H. GRIFFITHS COMBINED METAL MOLD FOR CASTING AND'STRIPPING INGOTS Filed July 18 1936 Patented Dec. 29, 1936 ooiunmnnMETAL MOLD ron. CASTING AND s'rmrmo. moors Septimus n. Grimm,- Canton,Ohio Application July 18, 1936, Serial No. 91,421

, 5 Claims. (01. 22-139 This invention relates to an improved and novelsectional mold for casting ingots from molten steel or other desirablemolten metals, said mold being so designed as to constitute an ingotcasting and self-stripping mold for producing large end up ingots and iscomposed of two sections,

a major upper section and, a lower minor sec-' tion, with means forcausing the upper section to be automatically and truly centered uponthe upper face of the lower section at the point of juncture of the twosections.

The prime object of the invention is to provide a. simple, novel,economical, practical and thoroughly efficient self-stripping mold thatserves to prevent the formation of piping or blow-holes and to produce asolid ingot forming a homogeneous composition throughout.

Another object of the invention is to so form and construct a twosection mold that the inner wall thereof will be inclined gradually fromits top to its bottom in true alinement and of such dimensions as toproduce an ingot having a smooth exterior surface, and that'willeffectually prevent the formation of a fin or fissure around its'outersurface. 1

Another object of the invention panying drawing, and particularlypointed out in the claims appended hereto, it being understood thatslight changes in the precise shape, proportions and minor details ofthe construction may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the accompanying drawing forming apart of this specification it willbe seen that:

' section of the mold, showing it partly in section,

is to so construct the two sections of the mold that the I lower sectionwill be fixedly secured to anysuitable or desirable support to preventits movement away from said support when it is desired to lift the uppersection carrying the ingot away from said lower section, and to permitthe self centering of the two sections of the mold when placing thesections together in readiness for th molding operation.

Further objects of the invention are to so construct my improvedsectional mold that it will dispensewith the use of plugs of all kindsand types that have been heretofore employed for closing the openbottoms of the mold and for lifting the ingot from the mold; to dispensewith inverted stripping of the mold; to eliminate the employment ofcostly plungers and other equipment heretofore employed for forcing theingot out of its mold, and to' form a mold that is selfstrinping,thereby saving time, labor, fuel and ex- Y by the combination,arrangement, location and pause, and to materially increase the numberof ingots produced within a certain period of time and at the same timeimprove the quality of the ingot product. g

The foregoing and such other objects as may appear from the ensuingdescription are attained construction of the several parts hereinafterand showing in full lines the projected end of the ingot when seatedupon its support.

Figure 3 is a view partly in section and partly in elevation, showingthe ingot stripped from the inner wall of the large upper section withthe upper end of the ingot projected above the upper end of said sectionwith the lower end of the section seated on its support, and

Figure 4 is a detail vertical section taken in the plane of the dottedlines 4- -4, Fig. 1, showing a portion of the upper section broken awaywith its lower end portion seated on the lower section and the means forlocking the lower section to'its support with the support broken away.

In 'the embodiment of my invention as illustrated it will be seen thatthe numeral 2 indicates the larger upper section'of the mold formed withintegral outwardly extended lugs or ears 3 at its upper end portion towhich suitable lifting means are removably attached for lifting andmoving the said section away from contact with the lower smaller section4' of the mold, and the lower endof said larger section 2 is providedwith a plurality of integral outwardly, downwardly and oppositelydisposed laterally extended formations 5, ,each of the formations havingits upper face beveled downwardlyand outwardly at ,6, then extendeddownwardly? and terminating with a horiinwardly beveled 'or inclined andterminating with more fully described, illustrated in the-accornavertically disposed shouldered portion 9 terminating with thehorizontally extended meeting face. In forming the point of juncturewith the upper face of the lower section, as shown in Figs. 2 and 4' ofthe drawing, while the lower section 4' is provided at its upper endwith simi 'lar butupwardly extended and oppositely disposed integralformations ll reversely beveled or inclined, as shown in Fig. 1, so thatwhen it is desired to join the sections together it is simply necessaryto lower the upper section 2 until the lowermost beveled inner faces 8of each of its downward extensions overlap and engage withface of thebeveled upward extensions ll formed at the upper end of-said section 4'to overlap and engage with the lowermost outer end portion of thesection 2, and said section 2 by a further lowering thereof will beautomatically guided to and properly and accurately centered upon themeeting face of the lower section by contact with the verticallydisposed shouldered portions forming a part of each of the laterallydisposed extensions or formations 5 and II, thus causing the meetingfaces of the sections which are preferably so machined as to form atrue, accurate and tight juncture of the said meeting faces.

Both of the mold sections are preferably formed of cast iron and .whenunited at the point of juncture the inner wall is inclined graduallyinwardly from the top to the bottom thereof, terminating with a concavedsolid bottom, said formation being provided for the production of largeend up ingots; for eliminating and dispensing with the use of alltypesof plugs and ingot lifters heretofore employed in connection with moldsfor casting ingots.

By the construction of my improved form of large end up mold the moltenmetal assures progressive solidification from the bottom to the top ofthe ingot; serves to prevent the formation of piping and. blow holes,which is a prime factor to soundness and homogeneity; the production ofa higher grade and quality of'ingot possessing a smooth exterior surfaceand interior, and adds to the value and quality of the rolled productproduced from the ingot. e

It will also be readily perceived that 'by thisspecially designed typeof mold there is no fastening means employed to lock the sectionstogether', hence neither time nor labor is required for unlocking orreleasing such fastening means, since the larger section or member issimply lowered and is automatically guided by the aforesaid beveledextensions until the meeting faces truly and smoothly contact with andare held truly in their properly alinedposition by the verticallydisposed shouldered portions at the point of juncture. By thisparticular construction of mold the two sections are intended to havespecial proportions or inside capacities with' relation to each other,that is, the lower section has a standard capacity for the reception ofonefifth only of the entire inner capacity of the mold for the receptionof the molten metal, since it has been successfully demonstrated thatsuch standard capacity of the smaller lower section of the mold preventsthe possibility of a fin or fissure forming around the'ingot at thepoint of juncture of the two sections, for the reason that when pouringfluid steel at a temperature of 2850 to 2900" F. into a comparativelycold metal mold, which is usually about 400 F. in good practice,

from an elevation of about seven feet, the aver-V,

age mold being seventy-two"inches'ih height, when the hotmetalstrikes'the bottom portion of the mold or inside face thereof a skim,scum 1 or film is immediately formed, owing to contact of a scum or filmthat rises above the point of juncture of the sections, seals thejuncture portion of the mold, and thereby eliminates the formation of a.tin or fissure -of any type whatever around the outer surface of theingot.

It will be seen that the lower minor section of the mold is seated upona suitable support It, and is provided on each opposite side thereof atits lower end portion with an integral projected lug or ear I! for thereception of an elongated metal link I4, said link being adapted to beswung over a fixed lateral extension l6 having an upward and inwardlybeveled or inclined surface I6 for the reception of the lower portion ofI being charged with molten metal, and for the mold stripping operation.

When it is desired to strip the ingot from the.

mold the upper larger sectioncarrying the entire ingot is lifted fromthe lower section with the solid convexed lower end of the ingot pro--jected below the lowermost face of said larger and seated upon asuitable support with the projected, lower concaved face of the ingotseated upon the upper face of the support, so that when the ingot isseated upon its support it will cause the automatic gravitation of thelarge heavy uppersection until its projected lowermost faces 1 arecaused to assume the position shown in Fig. 3 of the drawing,saidautom'atic actionsimultaneously causing the ingot to be forced andstripped away from the inner wall of .the mold and cause the upper endof the ingot to be projected above the upper end of the mold section,

when the usual means employed for the purpose,

in' ingot foundries is used to grip said upper projected portion of theingot and convey it away to the soaking pit, heating furnace or otherdesirable destination, thereby facilitating and simplifying the rapidstripping of ingots by the use of sectional molds of the typehereinbefore referred to. I

It will be understood that this construction of mold is-adapted for usein connection with all kinds of molten metal for casting ingots orslabs. especially with relation'to what is commonly known in the art asrimming oreifervescing steel. Further, it will 'be seen that theextensions 6 formed on the lower end portion of the major section 2serves as a rest therefor, and also serve to prevent contact of itsmeeting face with any foreign matter that may accumulate on theofjuncture with the minor section of the mold.

Having thus described my invention, what I claim and desire to secure byLetters Patent'is:

1. A metal mold for casting self-stripping ingots, comprising an uppermajor section having an integral oppositely disposed beveled andshouldered downward extension projected below its meeting face at twosides thereof, a minor lower section provided with an integraloppositely disposed reversely beveled and shouldered extensection and ismoved to another .positiori over 2,065,969 sion at two sides thereofprojecting above its meeting face between the extensions of the majorsection, with the said shouldered portions of the major sectionoverlapping and in contact with the outer wall of the upper end of theminor section, while the shouldered portions of the minor sectioncontact with and overlap the lower outer wall of the major section, allof said extensions coacting simultaneously and jointly serving toautomatically guide, center and maintain the meeting face of thesectionsinto true alinement between the shouldered portions of said extensionsat the point of juncture and to form a tight joint at the said point.

2. A metal mold for casting self-stripping. ingots, comprising a majorupper section provided with an integral downwardly disposed extension atopposite sides thereof projected below the meeting face of the sectionand formed with an inwardly and upwardly beveled face, a lower minorsection having an integral lateral extension at its opposite sidesprojected above its meeting face with the inner face of the extensionsbeveled inwardly and downwardly, a support for the mold disposed belowsaid sections, means for fixedly securing the minor section to the moldsupport, consisting of two integral and oppositely projected formationsnear the bottom of said minor section for the reception of one endportion of an elongated metal link, and a laterally extended fixedmember at each side of the mold support, so that the said link may beeasily swung over the said fixed members, thereby fixedly securing theminor section to the support.

3. A metal mold for casting self-stripping ingots of the characterdescribed, comprising two sections horizontally separated, a moldsupport disposed below said sections, an upper major section formed soas to carry the entire ingot when lifted away from the other section, aminor lower section for forming a lower convexed end to the ingot, meanssecured to the minor section I and the mold support for fixedly securingsaid ing the entire ingot with the lower convexed end of the ingotprojecting below the lowermost end of said major section, and seatingsaid convexed end of the ingot upon the support, thereby owing to thestructural formation of the innerwall of the major mold section withrelation to the outer wall of the ingot causing the major sectiononly togravitate and be seated upon the support simultaneously forcing andstripp the ingot from the inner wall and project the upper end of theingot above the top of the major section.

4. A mtal'mold for casting self-stripping ingots of the characterdescribed, comprising two,

sections horizontally separated, a mold support for said sections, anupper major section having a plurality of downwardly extended portionsat its lower end and formed so as to carry the entire ingot when liftedaway'from the other section, a minor lower section for forming a solidconvexed lower end .ingot, means secured to the minor section and to themold support for fixedly securing said minor section to the support, theminor section having only one-fifth of the inner capacity of the entiremold, outwardly extended lugs formed at the upper portion of the majorsection for lifting it away from the minor section and seating theconvexed lowermost end of the ingot upon the support, whereby thestructural formation of the inner wall of the major mold section withrelation to the outer wall of the ingot causes the said major sectiononly to gravitateand be seated upon the support simultaneously forcingand stripping the ingot from said inner wall and project'the upper endof the ingot above the upper end of the major section.

'most end to the ingot, a support for the mold disposed below bothsections, means secured to,

the lower section and to said support" for fixi edly securing said lowersection to the support, outwardly extended lugs formed at the topportion of the major section for lifting it away from the lower section,said major section being formed so as to carry the entire ingot awayfrom the lower section with its lower end portion projecting below thebottom of the major section, and seating the lowermost concaved 'endportion of the ingot on the support, which owing to the structuralformation of the inner wall of the major section with relation to theouter wall of the ingot will cause the majo ection only to gravitateuntil seated upon th e koggort and simultaneously strip and force the int away from said inner wall of the said section and project the upperend of the ingot above the top of the major section,

SEPTIMUS H. GRIFFITHS.

